Crossword Genius

Bad cooking fat, in Spanglish? (7)

Ross

I believe the answer is:

mallard

(Other definitions for mallard that I've seen before include "Engine holding the world speed record for a steam locomotive, set at 123mph in 1938" , "Kind of duck" , "The famous steam train" , "Common wild duck" , "Ancestor of all domestic ducks" .)

I've seen this clue in the Universal.
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